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Some RDMA work and some good bugfixes, and two new features that could

Browse source 
benefit from user testing:
 
 Anna Schumacker contributed a simple NFSv4.2 COPY implementation.  COPY
 is already supported on the client side, so a call to copy_file_range()
 on a recent client should now result in a server-side copy that doesn't
 require all the data to make a round trip to the client and back.
 
 Jeff Layton implemented callbacks to notify clients when contended locks
 become available, which should reduce latency on workloads with
 contended locks.
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Merge tag 'nfsd-4.9' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "Some RDMA work and some good bugfixes, and two new features that could
  benefit from user testing:

   - Anna Schumacker contributed a simple NFSv4.2 COPY implementation.
     COPY is already supported on the client side, so a call to
     copy_file_range() on a recent client should now result in a
     server-side copy that doesn't require all the data to make a round
     trip to the client and back.

   - Jeff Layton implemented callbacks to notify clients when contended
     locks become available, which should reduce latency on workloads
     with contended locks"

* tag 'nfsd-4.9' of git://linux-nfs.org/~bfields/linux:
  NFSD: Implement the COPY call
  nfsd: handle EUCLEAN
  nfsd: only WARN once on unmapped errors
  exportfs: be careful to only return expected errors.
  nfsd4: setclientid_confirm with unmatched verifier should fail
  nfsd: randomize SETCLIENTID reply to help distinguish servers
  nfsd: set the MAY_NOTIFY_LOCK flag in OPEN replies
  nfs: add a new NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK constant
  nfsd: add a LRU list for blocked locks
  nfsd: have nfsd4_lock use blocking locks for v4.1+ locks
  nfsd: plumb in a CB_NOTIFY_LOCK operation
  NFSD: fix corruption in notifier registration
  svcrdma: support Remote Invalidation
  svcrdma: Server-side support for rpcrdma_connect_private
  rpcrdma: RDMA/CM private message data structure
  svcrdma: Skip put_page() when send_reply() fails
  svcrdma: Tail iovec leaves an orphaned DMA mapping
  nfsd: fix dprintk in nfsd4_encode_getdeviceinfo
  nfsd: eliminate cb_minorversion field
  nfsd: don't set a FL_LAYOUT lease for flexfiles layouts
This commit is contained in:
Linus Torvalds 2016-10-13 21:04:42 -07:00
commit 2778556474
25 changed files with 683 additions and 96 deletions
Download patch file Download diff file Expand all files Collapse all files

2
net/sunrpc/xprtrdma/svc_rdma_backchannel.c
View file

@ -129,7 +129,7 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
ret = -EIO;
goto out_unmap;
}
atomic_inc(&rdma->sc_dma_used);
svc_rdma_count_mappings(rdma, ctxt);
memset(&send_wr, 0, sizeof(send_wr));
ctxt->cqe.done = svc_rdma_wc_send;

2
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View file

@ -159,7 +159,7 @@ int rdma_read_chunk_lcl(struct svcxprt_rdma *xprt,
ctxt->sge[pno].addr);
if (ret)
goto err;
atomic_inc(&xprt->sc_dma_used);
svc_rdma_count_mappings(xprt, ctxt);
ctxt->sge[pno].lkey = xprt->sc_pd->local_dma_lkey;
ctxt->sge[pno].length = len;

82
net/sunrpc/xprtrdma/svc_rdma_sendto.c
View file

@ -225,6 +225,48 @@ svc_rdma_get_reply_array(struct rpcrdma_msg *rmsgp,
return rp_ary;
}
/* RPC-over-RDMA Version One private extension: Remote Invalidation.
* Responder's choice: requester signals it can handle Send With
* Invalidate, and responder chooses one rkey to invalidate.
*
* Find a candidate rkey to invalidate when sending a reply. Picks the
* first rkey it finds in the chunks lists.
*
* Returns zero if RPC's chunk lists are empty.
*/
static u32 svc_rdma_get_inv_rkey(struct rpcrdma_msg *rdma_argp,
struct rpcrdma_write_array *wr_ary,
struct rpcrdma_write_array *rp_ary)
{
struct rpcrdma_read_chunk *rd_ary;
struct rpcrdma_segment *arg_ch;
u32 inv_rkey;
inv_rkey = 0;
rd_ary = svc_rdma_get_read_chunk(rdma_argp);
if (rd_ary) {
inv_rkey = be32_to_cpu(rd_ary->rc_target.rs_handle);
goto out;
}
if (wr_ary && be32_to_cpu(wr_ary->wc_nchunks)) {
arg_ch = &wr_ary->wc_array[0].wc_target;
inv_rkey = be32_to_cpu(arg_ch->rs_handle);
goto out;
}
if (rp_ary && be32_to_cpu(rp_ary->wc_nchunks)) {
arg_ch = &rp_ary->wc_array[0].wc_target;
inv_rkey = be32_to_cpu(arg_ch->rs_handle);
goto out;
}
out:
dprintk("svcrdma: Send With Invalidate rkey=%08x\n", inv_rkey);
return inv_rkey;
}
/* Assumptions:
* - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
*/
@ -280,7 +322,7 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
sge[sge_no].addr))
goto err;
atomic_inc(&xprt->sc_dma_used);
svc_rdma_count_mappings(xprt, ctxt);
sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey;
ctxt->count++;
sge_off = 0;
@ -464,7 +506,8 @@ static int send_reply(struct svcxprt_rdma *rdma,
struct page *page,
struct rpcrdma_msg *rdma_resp,
struct svc_rdma_req_map *vec,
int byte_count)
int byte_count,
u32 inv_rkey)
{
struct svc_rdma_op_ctxt *ctxt;
struct ib_send_wr send_wr;
@ -489,7 +532,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
ctxt->sge[0].length, DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
goto err;
atomic_inc(&rdma->sc_dma_used);
svc_rdma_count_mappings(rdma, ctxt);
ctxt->direction = DMA_TO_DEVICE;
@ -505,7 +548,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
if (ib_dma_mapping_error(rdma->sc_cm_id->device,
ctxt->sge[sge_no].addr))
goto err;
atomic_inc(&rdma->sc_dma_used);
svc_rdma_count_mappings(rdma, ctxt);
ctxt->sge[sge_no].lkey = rdma->sc_pd->local_dma_lkey;
ctxt->sge[sge_no].length = sge_bytes;
}
@ -523,23 +566,9 @@ static int send_reply(struct svcxprt_rdma *rdma,
ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
ctxt->count++;
rqstp->rq_respages[page_no] = NULL;
/*
* If there are more pages than SGE, terminate SGE
* list so that svc_rdma_unmap_dma doesn't attempt to
* unmap garbage.
*/
if (page_no+1 >= sge_no)
ctxt->sge[page_no+1].length = 0;
}
rqstp->rq_next_page = rqstp->rq_respages + 1;
/* The loop above bumps sc_dma_used for each sge. The
* xdr_buf.tail gets a separate sge, but resides in the
* same page as xdr_buf.head. Don't count it twice.
*/
if (sge_no > ctxt->count)
atomic_dec(&rdma->sc_dma_used);
if (sge_no > rdma->sc_max_sge) {
pr_err("svcrdma: Too many sges (%d)\n", sge_no);
goto err;
@ -549,7 +578,11 @@ static int send_reply(struct svcxprt_rdma *rdma,
send_wr.wr_cqe = &ctxt->cqe;
send_wr.sg_list = ctxt->sge;
send_wr.num_sge = sge_no;
send_wr.opcode = IB_WR_SEND;
if (inv_rkey) {
send_wr.opcode = IB_WR_SEND_WITH_INV;
send_wr.ex.invalidate_rkey = inv_rkey;
} else
send_wr.opcode = IB_WR_SEND;
send_wr.send_flags = IB_SEND_SIGNALED;
ret = svc_rdma_send(rdma, &send_wr);
@ -581,6 +614,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
int inline_bytes;
struct page *res_page;
struct svc_rdma_req_map *vec;
u32 inv_rkey;
dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
@ -591,6 +625,10 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
wr_ary = svc_rdma_get_write_array(rdma_argp);
rp_ary = svc_rdma_get_reply_array(rdma_argp, wr_ary);
inv_rkey = 0;
if (rdma->sc_snd_w_inv)
inv_rkey = svc_rdma_get_inv_rkey(rdma_argp, wr_ary, rp_ary);
/* Build an req vec for the XDR */
vec = svc_rdma_get_req_map(rdma);
ret = svc_rdma_map_xdr(rdma, &rqstp->rq_res, vec, wr_ary != NULL);
@ -633,9 +671,9 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
goto err1;
ret = send_reply(rdma, rqstp, res_page, rdma_resp, vec,
inline_bytes);
inline_bytes, inv_rkey);
if (ret < 0)
goto err1;
goto err0;
svc_rdma_put_req_map(rdma, vec);
dprintk("svcrdma: send_reply returns %d\n", ret);
@ -692,7 +730,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
svc_rdma_put_context(ctxt, 1);
return;
}
atomic_inc(&xprt->sc_dma_used);
svc_rdma_count_mappings(xprt, ctxt);
/* Prepare SEND WR */
memset(&err_wr, 0, sizeof(err_wr));

60
net/sunrpc/xprtrdma/svc_rdma_transport.c
View file

@ -198,6 +198,7 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
out:
ctxt->count = 0;
ctxt->mapped_sges = 0;
ctxt->frmr = NULL;
return ctxt;
@ -221,22 +222,27 @@ out_empty:
void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
{
struct svcxprt_rdma *xprt = ctxt->xprt;
int i;
for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
struct ib_device *device = xprt->sc_cm_id->device;
u32 lkey = xprt->sc_pd->local_dma_lkey;
unsigned int i, count;
for (count = 0, i = 0; i < ctxt->mapped_sges; i++) {
/*
* Unmap the DMA addr in the SGE if the lkey matches
* the local_dma_lkey, otherwise, ignore it since it is
* an FRMR lkey and will be unmapped later when the
* last WR that uses it completes.
*/
if (ctxt->sge[i].lkey == xprt->sc_pd->local_dma_lkey) {
atomic_dec(&xprt->sc_dma_used);
ib_dma_unmap_page(xprt->sc_cm_id->device,
if (ctxt->sge[i].lkey == lkey) {
count++;
ib_dma_unmap_page(device,
ctxt->sge[i].addr,
ctxt->sge[i].length,
ctxt->direction);
}
}
ctxt->mapped_sges = 0;
atomic_sub(count, &xprt->sc_dma_used);
}
void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
@ -600,7 +606,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
goto err_put_ctxt;
atomic_inc(&xprt->sc_dma_used);
svc_rdma_count_mappings(xprt, ctxt);
ctxt->sge[sge_no].addr = pa;
ctxt->sge[sge_no].length = PAGE_SIZE;
ctxt->sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey;
@ -642,6 +648,26 @@ int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
return ret;
}
static void
svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt,
struct rdma_conn_param *param)
{
const struct rpcrdma_connect_private *pmsg = param->private_data;
if (pmsg &&
pmsg->cp_magic == rpcrdma_cmp_magic &&
pmsg->cp_version == RPCRDMA_CMP_VERSION) {
newxprt->sc_snd_w_inv = pmsg->cp_flags &
RPCRDMA_CMP_F_SND_W_INV_OK;
dprintk("svcrdma: client send_size %u, recv_size %u "
"remote inv %ssupported\n",
rpcrdma_decode_buffer_size(pmsg->cp_send_size),
rpcrdma_decode_buffer_size(pmsg->cp_recv_size),
newxprt->sc_snd_w_inv ? "" : "un");
}
}
/*
* This function handles the CONNECT_REQUEST event on a listening
* endpoint. It is passed the cma_id for the _new_ connection. The context in
@ -653,7 +679,8 @@ int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
* will call the recvfrom method on the listen xprt which will accept the new
* connection.
*/
static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
static void handle_connect_req(struct rdma_cm_id *new_cma_id,
struct rdma_conn_param *param)
{
struct svcxprt_rdma *listen_xprt = new_cma_id->context;
struct svcxprt_rdma *newxprt;
@ -669,9 +696,10 @@ static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
new_cma_id->context = newxprt;
dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
newxprt, newxprt->sc_cm_id, listen_xprt);
svc_rdma_parse_connect_private(newxprt, param);
/* Save client advertised inbound read limit for use later in accept. */
newxprt->sc_ord = client_ird;
newxprt->sc_ord = param->initiator_depth;
/* Set the local and remote addresses in the transport */
sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
@ -706,8 +734,7 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id,
dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
"event = %s (%d)\n", cma_id, cma_id->context,
rdma_event_msg(event->event), event->event);
handle_connect_req(cma_id,
event->param.conn.initiator_depth);
handle_connect_req(cma_id, &event->param.conn);
break;
case RDMA_CM_EVENT_ESTABLISHED:
@ -941,6 +968,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
struct svcxprt_rdma *listen_rdma;
struct svcxprt_rdma *newxprt = NULL;
struct rdma_conn_param conn_param;
struct rpcrdma_connect_private pmsg;
struct ib_qp_init_attr qp_attr;
struct ib_device *dev;
unsigned int i;
@ -1070,7 +1098,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
dev->attrs.max_fast_reg_page_list_len;
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
newxprt->sc_reader = rdma_read_chunk_frmr;
}
} else
newxprt->sc_snd_w_inv = false;
/*
* Determine if a DMA MR is required and if so, what privs are required
@ -1094,11 +1123,20 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
/* Swap out the handler */
newxprt->sc_cm_id->event_handler = rdma_cma_handler;
/* Construct RDMA-CM private message */
pmsg.cp_magic = rpcrdma_cmp_magic;
pmsg.cp_version = RPCRDMA_CMP_VERSION;
pmsg.cp_flags = 0;
pmsg.cp_send_size = pmsg.cp_recv_size =
rpcrdma_encode_buffer_size(newxprt->sc_max_req_size);
/* Accept Connection */
set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
memset(&conn_param, 0, sizeof conn_param);
conn_param.responder_resources = 0;
conn_param.initiator_depth = newxprt->sc_ord;
conn_param.private_data = &pmsg;
conn_param.private_data_len = sizeof(pmsg);
ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
if (ret) {
dprintk("svcrdma: failed to accept new connection, ret=%d\n",